Nominal, a type of qualitative data which groups variables into categories., Ordinal, a kind of qualitative data that groups variables into ordered categories., Interval, measured along a numerical scale that has equal distances between adjacent values., Ratio, a form of quantitative (numeric) data., Qualitative, data representing information and concepts that are not represented by numbers., Quantitative, measures of values or counts and are expressed as numbers., Discrete, Data that can only take certain values, Continuous, data that can take any value..

Collecting data

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